Of these modes of fracture, the following require trepanning: the contusion,
whether the bone be laid bare or not; and the fissure, whether apparent
or not. And if, when an indentation (hedra) by a weapon takes place in
a bone it be attended with fracture and contusion, and even if contusion
alone, without fracture, be combined with the indentation, it requires
trepanning. A bone depressed from position rarely requires trepanning;
and those which are most pressed and broken require trepanning the least;
neither does an indentation (hedra) without fracture and contusion require
trepanning; nor does a notch, provided it is large and wide; for a notch
and a hedra are the same.